‘Fatal error’ message when trying to edit with visual composer

Hi,

When I try to edit with visual composer, this error message appears. I’m assuming it has to do with layer slider, I’ve tried to get into layer slider to try and work it out but have had no luck fixing it. Does anyone know what this is referring to/how to fix it?

Fatal error: Cannot redeclare layerslider_init() (previously declared in /home/hiddenharvest/public_html/wp-content/plugins/LayerSlider/wp/shortcodes.php:6) in /home/hiddenharvest/public_html/wp-content/plugins/LayerSlider/wp/shortcodes.php on line 47

Thanks,
Meg